根据我个人经验…

According to my personal experience, ...

=based on my personal experience, ..

...无论如何强调都不为过

... cannot be overemphasized

交通安全的重要性无论如何强调都不为过。

The importance of traffic safety cannot be overemphasized.

根据我个人经验，微笑已带给我许多好处。

According to my personal experience, smile has done me a lot of good.

在我的求学过程中，我忘不了学习英文所遭到的大困难。

In the course of my schooling. I will never forget the great difficulty I encountered in learning English.